I’m fine with someone having a negative opinion of China so long as they don’t use that as a purity test and demand everyone else denounce China, calling people “fascists” or “tankies” and refusing to work with them otherwise.

There are people who think China is actively imperialist instead of a semi periphery country and is as bad as the US and Western Europe, or even that they’re worse, and that China deserves to be balkanized and beaten down. Those people are not leftists, they are Western chauvinists.

Then there are people who may have a negative opinion on China, but will defend China against imperialist extraction and aggression. Those people are leftists that don’t like China.